The invention discloses an image fusing method based on SFIM and IHS transformation, which carries out pretreatment, such as geometric registration, de-noising, etc., for high spatial resolution images and high spectral resolution images; carries out HIS transformation for the RGB wave bands(R<0>, G<0>,B<0>) of the original high spatial resolution images with IHS transformation formula and respectively extracts I, H, and S components; carries out SFIM calculation for I component based on (I) formula, that is substituting I for P, high spatial resolution images for P, and obtains I through calculation; obtains R, G and B based on IHS inversion formula, and then obtains the fusing result through superimposing wave bands. The invention introduces SFIM model, and presents the fusing method of combining SFIM and HIS, which can not only conspicuously maintain spectral characteristics, but also avoid introducing complex, time-consuming frequency decomposition and reconstruction process.